/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbfilter.impl;

import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Restrictions;
import org.jbfilter.core.FilterComponent;

abstract class _FilterComponentHibernateSupport<E, C extends FilterComponent<E>> {

	private C filterComponent;
	
	_FilterComponentHibernateSupport(C filterComponent) {
		super();
		this.filterComponent = filterComponent;
	}
	public C getFilterComponent() {
		return filterComponent;
	}
	public Criterion getCriterion() {
		return applyInvertedIfNecessary(buildCriterion());
	}

	private Criterion applyInvertedIfNecessary(Criterion critIn) {
		if (critIn == null) {
			return null;
		}
		if (filterComponent.isInverted()) {
			return Restrictions.not(critIn);
		} else {
			return critIn;
		}
	}

	protected abstract Criterion buildCriterion();
}
